a-a a-c a-t aaa aac aae aap aat ac- aca acc ace acp act aea aec aee aep aet ap- apa apc ape app apt at- ata atc ate atp att c-- caa cac cae cap cat cca ccc cce ccp cct ce- cea cec cee cep cet cpa cpc cpe cpp cpt cta ctc cte ctp ctt eaa eac eae eap eat ec- eca ecc ece ect eea eec eee eep eet ep- epa epc epe epp ept eta etc ete etp ett p-p paa pac pae pap pat pca pcc pce pcp pct pea pec pee pep pet ppa ppc ppe ppp ppt pt- pta ptc pte ptp ptt taa tac tae tap tat tca tcc tce tcp tct te- tea tec tee tep tet tpa tpc tpe tpp tpt tta ttc tte ttp ttt